remove 3.9 bw compat In cw 3.9, interfaces are deprecated and replaced with adapters, yielding a lot of bw compat in many places -- most if this patch is concerned with the interface bw compat - cwvreg: interface cleanup - doc/adapters.rst: interface cleanup - entities/adapters.py, wfobjs.py: interfaces bw compat - entity.py: interfaces bw compat, also get_value, delete, attr_metadata, has_perm, set_related_cache, clear_related_cache, clear_related_cache, related_rql - predicates.py: score_interfaces & implements - interfaces.py & mixins.py: 100% gone - view.py: implement_adapter_compat, unwrap_adapter_compat - calendar.py, editcontroller.py, ibreadcrumbs.py, navigation.py, xmlrss.py: interface bw compat - treeview.py: salvage one function from mixins.py Related to #2782004.

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Templates

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*Templates* are specific views that do not depend on a result set. The basic

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class `Template` (`cubicweb.common.view`) is derived from the class `View`.

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To build a HTML page, a *main template* is used. In general, the template of

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identifier `main` is the one to use (it is not used in case an error is raised or for

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the login form for example). This template uses other templates in addition

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to the views which depends on the content to generate the HTML page to return.

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A *template* is responsible for:

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1. executing RQL query of data to render if necessary

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2. identifying the view to use to render data if it is not specified

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3. composing the HTML page to return

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You will find out more about templates in :ref:`templates`.